takeWhile.ts

function takeWhile<T>(xs: T[], callback: (x: T, i: number) => boolean): T[] {
	let acc: T[] = [];
	xs.some((x, i) => {
		if (callback(x, i)) {
			acc.push(x);
			return false;
		} else {
			return true;
		}
	});
	return acc;
}